Inserting BLOB into table

HI, I am a newbie in PL/SQL, but I have a question about LOBs. My code below is to insert an image in a table. My question is, if I decide to return at a later date and perform my procedure once more to add another pict6.jpg at the table, would this procedure remove existing photos of the table and add only pict6.jpg? The reason I ask is because the update command line sets the column photo = empty_blob() every time that the anonymous block is run. If this is the case, what would be a better method to load images into a table? Thanks again for your time. My code is below, please excuse my notes, which I'm still learning:

GRANT CONNECT, RESOURCE to scott;

GRANT CREATE ANY DIRECTORY TO scott;

GRANT DROP ANY DIRECTORY to scott;

CREATE or CHANGE in ADPHOTO_DIR the DIRECTORY "C:\Temp".

GRANT READ ON DIRECTORY ADPHOTO_DIR to scott;

CONNECT scott/tiger2;

COMMIT;

-ALTER TABLE StudentRecord ADD (Photograph BLOB); <-can be used instead of the below -.

CREATE OR REPLACE StudentRecord TABLE

(First name VARCHAR2 (20) not null,)

LastName VARCHAR2 (40) not null,

HomeworkAvg NUMBER (6.2),

AttendanceAvg NUMBER (6.2),

ExamAvg NUMBER (6.2),

StudentID VARCHAR2 (10),

Photographing the BLOB

CONSTRAINT check_FirstName_LastName CHECK (FirstName! = LastName As String)

);

CREATE OR REPLACE PROCEDURE load_blob_from_file

(p_photo VARCHAR2)

f_photo BFILE.

b_photo BLOB;

BEGIN

UPDATE StudentRecord SET photo = empty_blob()

RETURN to photograph IN b_photo;

f_photo: = bfilename ('ADPHOTO_DIR', p_photo);

DBMS_LOB. FileOpen (f_photo, dbms_lob.file_readonly);

DBMS_LOB. LoadFromFile (b_photo, f_photo, dbms_lob.getlength (f_photo));

DBMS_LOB. FileClose (f_photo);

commit;

EXCEPTION

WHILE others THEN

dbms_output.put_line ('* ERROR * check your procedure.) ") ;

end;

-Run the load_blob_from_file procedure to insert the first picture in the table StudentRecord

EXECUTE load_blob_from_file ('pict1.jpg');

commit;

EXECUTE load_blob_from_file ('pict2.jpg');

commit;

EXECUTE load_blob_from_file ('pict3.jpg');

commit;

EXECUTE load_blob_from_file ('pict4.jpg');

commit;

EXECUTE load_blob_from_file ('pict5.jpg');

commit;

-Test to see if it worked

SELECT FirstName, dbms_lob.getlength (Photograph) "Photo Size"

OF StudentRecord;

Your procedure works only if there is always exactly 1 row in the table of StudentRecord. It seems highly unlikely - you probably wouldn't need store photos if your school takes care of a student.

Your definition of the procedure does not seem particularly reasonable. Of course, the goal is not to load a photo into the table, it must load the photo online of an individual to the student in the table. This means that your procedure should take a parameter that identifies which student photography is and the name of the photo. Normally, this would be the primary key of the table of StudentRecord.

Your table of StudentRecord, however, has no keys. It is a mistake. Each table must have a primary key. It does not appear that you have something that you could use as a natural key, we will create a synthetic key instead.

CREATE OR REPLACE TABLE StudentRecord
     ( StudentID NUMBER PRIMARY KEY,
       FirstName VARCHAR2(20) not null,
       LastName VARCHAR2(40) not null,
       HomeworkAvg NUMBER(6,2),
       AttendanceAvg NUMBER(6,2),
       ExamAvg NUMBER(6,2),
       StudentID VARCHAR2(10),
       Photograph BLOB,
       CONSTRAINT check_FirstName_LastName CHECK (FirstName != LastName)
    );

Once we do that, we can meaningfully define the procedure of the signature to the StudentID and the name of the image

CREATE OR REPLACE PROCEDURE load_blob_from_file
  (p_studentID StudentRecord.StudentID%TYPE,
  p_photo VARCHAR2)

Your UPDATE statement would then use the StudentID happened to determine which line to operate on a

UPDATE StudentRecord
     SET Photograph = empty_blob()
WHERE StudentID = p_StudentID
RETURN Photograph INTO b_photo;

That allows your procedure to work when there are multiple lines in the table of StudentRecord. It will make the new photo of an individual student to replace the old photo of this student only if there is.

Justin

Tags: Database

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How to insert data into tables using sql loops

Oracle 10.2 g

using Oracle sql * more

Table amounts is

create table student(id)
as
select distinct student_id
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now

desc student; will retrieve 

student
======
Name         Null?    Type
===========================
ID                  VARCHAR2(10)

Now create a sequence

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        298
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=========
1     234
2     298
.........

Why I'm doing this instead of

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as
select st_se.nextval,student_id
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using separate throws an error.

create table student(st_id,id)
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from student
as select distinct st_seq.nextval,academicyear
*
ERROR at line 2:
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Thank you.

Hello

As you discovered, you cannot use SELECT DISTINCT and sequence. NEXTVAL in the same query.

You can SELECT DISTINCT in a subquery, like this:

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AS
WITH     distinct_ids     AS
(
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     FROM     students_table
)
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compare the process with normal insert insertion and nested table inserts

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If the destination table is empty, then you can do ETG (CREATE TABLE AS SELECT...). This would be by far the fastest way. But to choose one of the choices you gave, the top hand is the first.

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Select Insert in a table without duplicate line
Hi guys,.

I need to migrate the data from table A in the old schema in table B of the new scheme.
The two tables contain exactly a similar structure.
For example: table A have neck one and col b, table B col, col b
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Col B, col A

now, my intention is to insert, select into table B to table A.
If there is similar data in Table B, I want to keep the data in Table B.

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A solution would be
```
insert into b (select * from a minus select * from b)
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Read the BLOB and insert data into a table

Hi all

Let us examine below on Oracle DB 12 c:

create table xx_test3 (c blob);

insert into xx_test3 (c) values (utl_raw.cast_to_raw(
'azertyuiop,qsdfghjklm,wxcvbn'));


create table xx_target (col1 varchar2(50));

Can someone guide me how to read the data and insert it into the xx_target table?

Necessary result is:


select * from xx_target;


COL1                                              

--------------------------------------------------
azertyuiop                                        
qsdfghjklm                                        
wxcvbn                                            

3 rows selected.

Thanks in advance,

Stoyanov.

insert into xx_target (col1)

with the data as)

Select utl_raw.cast_to_varchar2 (dbms_lob.substr (c, 32000, 1)) CBC

of xx_test3

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I wanted to insert a picture into the database using PLSQL table. Please let me know if the image file must be on a database server or I can insert it premises as well. Please find below my code and the error I get.

Call to the procedure and the error

BEGIN
load_blob_from_file
( 'D:\PRoJeCt-RS\OracleError', 'item', 'item_blob',  'id', '2');
END;

BEGIN
*
ERROR at line 1:
ORA-22285: non-existent directory or file for FILEEXISTS operation
ORA-06512: at "SYS.DBMS_LOB", line 504
ORA-06512: at "CMSRTPGM.LOAD_BLOB_FROM_FILE", line 18
ORA-06512: at line 2

My procedure to insert data into the table

CREATE OR REPLACE PROCEDURE load_blob_from_file
( src_file_name     IN VARCHAR2
, table_name        IN VARCHAR2
, column_name       IN VARCHAR2
, primary_key_name  IN VARCHAR2
, primary_key_value IN VARCHAR2 ) IS
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  des_blob      BLOB;
  src_blob      BFILE := BFILENAME('GENERIC',src_file_name);
  des_offset    NUMBER := 1;
  src_offset    NUMBER := 1;
  -- Define a pre-reading size.
  src_blob_size NUMBER;
  -- Define local variable for Native Dynamic SQL.
  stmt VARCHAR2(2000);
BEGIN
  -- Opening source file is a mandatory operation.
  IF dbms_lob.fileexists(src_blob) = 1 AND NOT dbms_lob.isopen(src_blob) = 1 THEN
    src_blob_size := dbms_lob.getlength(src_blob);
    dbms_lob.open(src_blob,DBMS_LOB.LOB_READONLY);
  END IF;
  -- Assign dynamic string to statement.  -- We are going to obtain the clob locator (pointer) to use later 
  stmt := 'UPDATE '||table_name||' '
       || 'SET    '||column_name||' = empty_blob() '
       || 'WHERE  '||primary_key_name||' = '||''''||primary_key_value||''' '
       || 'RETURNING '||column_name||' INTO :locator';
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  dbms_lob.loadblobfromfile( dest_lob     => des_blob
                           , src_bfile    => src_blob
                           , amount       => dbms_lob.getlength(src_blob)
                           , dest_offset  => des_offset
                           , src_offset   => src_offset );
  -- Close open source file.
  dbms_lob.close(src_blob);
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  IF src_blob_size = dbms_lob.getlength(des_blob) THEN
    $IF $$DEBUG = 1 $THEN
      dbms_output.put_line('Success!');
    $END
    ROLLBACK;
  ELSE
    $IF $$DEBUG = 1 $THEN
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  END IF;
END load_blob_from_file;

The table structure

CREATE TABLE ITEM
   (     "ID" NUMBER, 
     "TITLE" VARCHAR2(50), 
     "ITEM_BLOB" BLOB
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Thanks in advance!
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34MCA2K2

Published by: BluShadow on June 14, 2012 13:31
addition of {noformat}

{noformat} tags for readability.  Please read {message:id=9360002} and learn to do this yourself.

Yes,

Start by creating an object directory point to a physical directory on the server database as the 'oracle '.
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CONN / AS SYSDBA
CREATE or REPLACE DIRECTORY nom_repertoire as 'D:\Applications ';
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Here is the diagram user USER_NAME.

Then,.
create and populate a table to contain the images in the database your user to user schema.

and try this procedure...

DECLARE
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  l_bfile  BFILE;
  l_blob   BLOB;
BEGIN
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  l_bfile := BFILENAME(l_dir, l_file);
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  COMMIT;
END;

Thank you
Shankar

How to insert data into a BLOB column using sql

Hi all

How to insert data into the BLOB column directly using sql.

create  table temp
(
  a blob,
  b clob);

SQL> /
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                                  *
ERROR at line 1:
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http://download.Oracle.com/docs/CD/B12037_01/AppDev.101/b10802/u_raw.htm#997086
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1 row created.

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01400 00000 - "impossible to insert a NULL value in (%s)."
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Sudheeryekkala wrote:

Hello

I have a to insert a data in the other table.

My requirement is I field Date_effect_date in the departments, I would copy the details field in dept_effect_date of employees.

I used the query

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fall of ;

Rename emp_new to ;

* constraints/indexes if necessary be supported...

)

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Concerning
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